.page-about {
  display: block;
  --ax-line-soft: rgba(42, 51, 70, 0.75);
  --ax-glow: rgba(124, 77, 255, 0.22);
}

/* ===== hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 36px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 78vw;
  height: 78vw;
  max-width: 640px;
  max-height: 640px;
  background: radial-gradient(circle at 50% 50%, var(--ax-glow), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 9vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 54ch;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts .stat {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  min-width: 0;
}

.page-about .about-facts .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-facts .stat__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  color: var(--text-mute);
}

/* ===== section shell ===== */
.page-about .ax-sec {
  padding: 40px 0;
  border-top: 1px solid var(--ax-line-soft);
}

.page-about .ax-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .ax-sec__num {
  flex: none;
  font-size: 13px;
  color: var(--purple-lt);
  letter-spacing: 0.08em;
}

.page-about .ax-sec__title {
  margin: 0;
  font-size: clamp(22px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

.page-about .ax-sec__lede {
  max-width: 66ch;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .ax-sec__body > p {
  max-width: 62ch;
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .ax-sec__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--ax-line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .ax-sec__grid {
  display: grid;
  gap: 24px;
}

.page-about .ax-sec__caption {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-mute);
}

/* ===== version route ===== */
.page-about .ver {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .ver__item {
  position: relative;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900));
  min-width: 0;
}

.page-about .ver__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 44px;
  height: 3px;
  border-radius: var(--r-pill);
  background: var(--purple);
}

.page-about .ver__item--2::before {
  background: var(--purple-lt);
}

.page-about .ver__item--3::before {
  background: var(--cyan);
}

.page-about .ver__no {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ver__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.page-about .ver__desc {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .ver__note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-mute);
}

/* ===== timeline ===== */
.page-about .ax-sec--timeline {
  position: relative;
  overflow: hidden;
}

.page-about .ax-sec--timeline > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .tl-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.14;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 16%, #000 84%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 16%, #000 84%, transparent);
}

.page-about .tl-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .tl-legend {
  margin: 0 0 22px;
}

.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--purple), var(--cyan) 55%, var(--line));
  opacity: 0.6;
}

.page-about .tl__band {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 18px 0 10px 40px;
}

.page-about .tl__band:first-child {
  padding-top: 0;
}

.page-about .tl__band-name {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .tl__band-range {
  font-size: 12px;
  color: var(--text-mute);
}

.page-about .tl__node {
  position: relative;
  padding: 0 0 24px 40px;
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--purple);
}

.page-about .tl__node--major::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .tl__node--major .tl__name {
  font-size: 19px;
  color: var(--cyan);
}

.page-about .tl__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--text-mute);
}

.page-about .tl__idx {
  color: var(--purple-lt);
  font-size: 12px;
}

.page-about .tl__name {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  transition: color 200ms ease;
}

.page-about .tl__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .tl__node:hover .tl__name,
.page-about .tl__node:focus-within .tl__name {
  color: var(--purple-lt);
}

/* ===== chips ===== */
.page-about .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .chip {
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--ink-800);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ===== operations ===== */
.page-about .ops {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ops__item {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--purple);
  border-radius: var(--r-md);
  background: var(--ink-800);
  min-width: 0;
}

.page-about .ops__item:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .ops__item:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .ops__item:nth-child(4) {
  border-left-color: var(--green);
}

.page-about .ops__value {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
}

.page-about .ops__name {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .ops__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ===== next route ===== */
.page-about .next {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ax-line-soft);
}

.page-about .next__item:last-child {
  border-bottom: 0;
}

.page-about .next__no {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--purple);
  border-radius: 50%;
  font-size: 13px;
  color: var(--purple-lt);
}

.page-about .next__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.page-about .next__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ===== cross links ===== */
.page-about .about-links {
  margin-top: 26px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
}

.page-about .about-links__lead {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--text);
}

.page-about .about-links__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-links__list .service-chip {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--purple);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  background: rgba(124, 77, 255, 0.1);
  transition: background 180ms ease, border-color 180ms ease;
}

.page-about .about-links__list .service-chip:hover,
.page-about .about-links__list .service-chip:focus-visible {
  background: rgba(124, 77, 255, 0.24);
  border-color: var(--cyan);
}

.page-about .about-links__list .service-chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ===== media frames ===== */
.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== responsive ===== */
@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ver {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ops {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 44px 0 68px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 44px;
  }

  .page-about .about-hero__side {
    padding-bottom: 6px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ax-sec {
    padding: 56px 0;
  }

  .page-about .ax-sec__grid--split {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 40px;
  }

  .page-about .ax-sec__grid--flip {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .ax-sec__grid--flip .ax-sec__media {
    grid-row: 1;
  }

  .page-about .ax-sec__grid--flip .ax-sec__body {
    grid-row: 1;
  }

  .page-about .ops {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__name,
  .page-about .about-links__list .service-chip {
    transition: none;
  }
}